device-qemu-loongarch64: temporarily remove LTS and stable kernels

These will be replaced by linux-postmarketos-lts and
linux-postmarketos-stable very soon.

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7398>

device/main/device-qemu-loongarch64/APKBUILD

@@ -4,7 +4,7 @@
 maintainer="Aelin <aelin@postmarketos.org>"
 pkgname=device-qemu-loongarch64
 pkgver=5
-pkgrel=1
+pkgrel=2
 pkgdesc="Simulated device in QEMU (loongarch64)"
 url="https://postmarketos.org"
 arch="loongarch64"
@@ -16,8 +16,6 @@ depends="
 	"
 makedepends="devicepkg-dev"
 subpackages="
-	$pkgname-kernel-lts:kernel_lts
-	$pkgname-kernel-stable:kernel_stable
 	$pkgname-kernel-mainline:kernel_mainline
 	"
 
@@ -35,18 +33,6 @@ package() {
 	devicepkg_package $startdir $pkgname
 }
 
-kernel_lts() {
-	pkgdesc="Alpine LTS kernel (recommended)"
-	depends="linux-lts linux-firmware-none"
-	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
-}
-
-kernel_stable() {
-	pkgdesc="Alpine Stable kernel"
-	depends="linux-stable linux-firmware-none"
-	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
-}
-
 kernel_mainline() {
 	pkgdesc="postmarketOS mainline kernel"
 	depends="linux-postmarketos-mainline linux-firmware-none"